Assuming that (1) you live in a Non-Community Property State, (2) your home has only your name / SSN on titile AND was purchased prior to marriage , (3) your home was your main residence till moving to the new & husband's home, (4) your husband's house -- your main residence to be -- has only him on title / loan docs,
you do not need to involve your mortgage companies -- this is only a use change i.e. your house being changed from your main residence to a second home. Even if you let your parents live there it is still not a requirement. If you rent the property out ( i.e. use the property as income property) your home insurance needs to be told ( lower insurance ) and if you tell the lender, they may want to "do-over" the mortgage (because there is usually a 0.25% increase on income property ). Most people converting a home to rental property do change the insurance but do not inform the lender ( and as long as the property is maintained, taxes & mortgage paid, nobody cares and no laws are violated ). That is my take on this
